I'm using a SonicWall TZ 100 with a basic configuration of X0 for the LAN and X1 for the WAN. The WAN uses DHCP to obtain its routable IP address. I want to obtain a second routable IP from my ISP. I'm in luck because my cable company will provide me with an additional dynamic IP for $5/mo. How do I bind this IP to my SonicWall?

My additional dynamic IP will not be consecutive to the original one. It won't even be on the same class C. I think what I want to do is to use one of the empty ports/interfaces (X2, X3, or X4), tell that interface to use DHCP, and then add that interface to the WAN "zone". I can't figure out how to do this though. Here's what I've tried so far:

(1) I've looked in Network >> Interfaces. I see X0 and X1 but the other unused interfaces don't show up. I don't see an "Add" button to add the new interfaces.

(2) I've looked in Network >> Zones. I see that X0, X2, X3, X4 are in the LAN zone. I tried to drag X3 into the WAN zone but I can't. Nor does clicking the "Configure" button allow me to move an unused interface from LAN to WAN.

The S****wall TZ100 series definitely does support multiple WAN interfaces.
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SkyhawkOct 11 '12 at 17:59

I think I initially misread your response. So it DOES support multiple WANs? That's good news. I thought so. I'm sure there's an easy solution. I have a parallel post at SonicWall. Will let you know if I get an answer there.
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Chad DeckerOct 11 '12 at 18:21

Are you running the "Enhanced" version of SonicOS? You cannot change an interface's zone from LAN to WAN in the "Standard" version.
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SkyhawkOct 11 '12 at 20:22

I am running SonicOS Enhanced 5.6.0.11-61o. I was able to get the X4 interface shifted over to the WAN zone. I was also able tell it to use DHCP. It doesn't want to pick up an address though. Log says, "Retransmitting DHCP DISCOVER"... but no response from DHCP server.
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Chad DeckerOct 11 '12 at 21:04

#1 and #2 have already been done. My question was about how to do #3. Your snide comment is unappreciated. Did it ever occur to you that ISPs offer multiple DHCP addresses to customers for a reason? It's a very popular add-on service. Having multiple DHCP addresses is very common for home users who want to expose multiple services that both must use the same port (e.g. 443) and don't want the added expense of a static IP. You really need to relax.
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Chad DeckerOct 11 '12 at 18:11

ServerFault is intended for questions relating to professional network and systems administration, not "home user" scenarios. Professional sysadmins do not "expose services" on dynamic IPs.
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SkyhawkOct 11 '12 at 20:18

Thanks for the reference. The documentation you linked to says that transparent mode is for "spanning a single IP subnet across two or more interfaces." But is this what I want? I'd be dealing with multiple IP subnets, no? They might give me an IP of 55.55.55.55 for one interface and 66.66.66.66 on another.
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Chad DeckerOct 11 '12 at 18:15

Yes, you're right, L2 bridging would be more applicable of the two choices.
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porOct 11 '12 at 18:36